@article{heunenboixo:sequentializable,
  title = "Completely positive classical structures and sequentializable quantum protocols",
  author = "Chris Heunen and Sergio Boixo",
  year = "2011",
  journal = "QPL 2011, Electronic Proceedings in Theoretical Computer Science",
  pages = "91-101",
  volume = "95",
  doi = "10.4204/EPTCS.95.9",
}